would be nice to know that something changed from the K-5 to K-5 II regarding P-TTL (or more in flash handling).

Yes, one wouldn't think this would happen, but it turns out to often be the case. The update in July across the Metz lineup was necessary for K-01 support, even though that camera doesn't have any innovative new flash features. And the previous update was necessary to make rear-curtain functionality work for the K-r and K-5.

Sigma and Tumax have had similar problems, where an update is needed. Pentax may even do it on purpose to make things harder for reversed-engineered 3rd party flashes.